A projection display device is disclosed herein. The projection display device includes an image processing module and a light source driver. The image processing module is configured for receiving an image data and generating a display signal which includes an image period and a black state period. The light source driver is configured for generating a light driving signal to drive a projection light source, wherein the light driving signal includes a first segment and a second segment in the black state period, and the average amplitude of the light driving signal in the second segment is lower than the average amplitude of the light driving signal in the image period. A driving method is disclosed herein as well.
Legal claims defining the scope of protection. Each claim is shown in both the original legal language and a plain English translation.
1. A projection display device, comprising: an image processing module configured for receiving an image data and generating a display signal, the display signal comprising an image period and a black state period; and a light source driver configured for generating a light driving signal to drive a projection light source, wherein the projection light source is an ultra-high-performance (UHP) lamp, the light driving signal comprises a first segment and a second segment in the black state period, and an average amplitude of the light driving signal in the second segment is lower than the average amplitude of the light driving signal in the image period, and the amplitude of the light driving signal is constant in the image period, wherein the average amplitude of the light driving signal in the first segment is larger than the average amplitude of the light driving signal in the second segment and the average amplitude of the light driving signal in the image period.
A projection display device uses an image processing module to receive image data and create a display signal. This signal has an image period (when the image is displayed) and a black state period (when the screen is black). A light source driver generates a driving signal for a UHP (ultra-high-performance) lamp. During the black state period, the light driving signal has two segments: a first segment and a second segment. The average amplitude (strength) of the light driving signal in the second segment is lower than the average amplitude during the image period. The light driving signal amplitude is constant during the image period. The average amplitude of the light driving signal in the first segment of the black state period is larger than the average amplitude of the second segment AND larger than the average amplitude during the image period.
2. The projection display device of claim 1 , wherein a current level of the light driving signal in the first segment is higher than the current level of the light driving signal in the second segment during a positive half period of the light driving signal.
In the projection display device described in Claim 1, where the image processing module receives image data and creates a display signal with image and black state periods, and a light source driver generates a driving signal for a UHP lamp with first and second segments in the black state period such that the second segment's average amplitude is lower than the image period's, and the first segment's amplitude is larger than both, the current level of the light driving signal in the first segment of the black state period is higher than the current level in the second segment, specifically during the positive half period of the light driving signal. This means the positive voltage/current is stronger in the first segment.
3. The projection display device of claim 1 , wherein a current level of the light driving signal in the second segment is higher than the current level of the light driving signal in the first segment during an negative half period of the light driving signal.
In the projection display device described in Claim 1, where the image processing module receives image data and creates a display signal with image and black state periods, and a light source driver generates a driving signal for a UHP lamp with first and second segments in the black state period such that the second segment's average amplitude is lower than the image period's, and the first segment's amplitude is larger than both, the current level of the light driving signal in the second segment of the black state period is higher than the current level in the first segment, but ONLY during the negative half period of the light driving signal. This means the negative voltage/current is stronger in the second segment.
4. The projection display device of claim 1 , wherein the average amplitude of the light driving signal in the second segment is equal to about 30% of the signal average amplitude of the light driving signal in the image period.
In the projection display device described in Claim 1, where the image processing module receives image data and creates a display signal with image and black state periods, and a light source driver generates a driving signal for a UHP lamp with first and second segments in the black state period such that the second segment's average amplitude is lower than the image period's, and the first segment's amplitude is larger than both, the average amplitude (strength) of the light driving signal in the second segment of the black state period is about 30% of the average amplitude of the light driving signal during the image period.
5. The projection display device of claim 2 , wherein the average amplitude of the light driving signal in the second segment is equal to about 30% of the signal average amplitude of the light driving signal in the image period.
In the projection display device described in Claim 2, where the image processing module receives image data and creates a display signal with image and black state periods, and a light source driver generates a driving signal for a UHP lamp with first and second segments in the black state period such that the second segment's average amplitude is lower than the image period's, and the first segment's amplitude is larger than both, and the current level of the first segment is higher than the second during the positive half period, the average amplitude of the light driving signal in the second segment during the black state period is set to be approximately 30% of the average amplitude of the signal during the image period.
6. The projection display device of claim 3 , wherein the average amplitude of the light driving signal in the second segment is equal to about 30% of the signal average amplitude of the light driving signal in the image period.
In the projection display device described in Claim 3, where the image processing module receives image data and creates a display signal with image and black state periods, and a light source driver generates a driving signal for a UHP lamp with first and second segments in the black state period such that the second segment's average amplitude is lower than the image period's, and the first segment's amplitude is larger than both, and the current level of the second segment is higher than the first during the negative half period, the average amplitude of the light driving signal in the second segment of the black state period is about 30% of the average amplitude of the light driving signal during the image period.
7. The projection display device of claim 1 , wherein the average amplitude of the light driving signal in the first segment and the second segment is equal to zero.
In the projection display device described in Claim 1, where the image processing module receives image data and creates a display signal with image and black state periods, and a light source driver generates a driving signal for a UHP lamp with first and second segments in the black state period such that the second segment's average amplitude is lower than the image period's, and the first segment's amplitude is larger than both, the average amplitude of the light driving signal in both the first segment AND the second segment of the black state period is set to zero. This means the light is completely off during those segments.
8. The projection display device of claim 7 , wherein the light source driver further comprises: a luminance control module configured for generating a dimming signal according to a current control signal and a dimming control signal; and a dimming module configured for adjusting the luminance of the projection light source according to the dimming signal.
The projection display device described in Claim 7, where the image processing module receives image data and creates a display signal with image and black state periods, and a light source driver generates a driving signal for a UHP lamp with first and second segments (both with zero amplitude) in the black state period, includes a luminance control module that generates a dimming signal based on a current control signal and a dimming control signal. Also included is a dimming module that adjusts the light source's brightness based on this dimming signal. The dimming module controls the lamp's brightness according to the signals received from the luminance control module, allowing for dynamic adjustments beyond just the black state period modulation.
9. The projection display device of claim 8 , wherein the projection display device further comprises a micro controller configured for receiving a setting command for the current control signal and the dimming signal from an input interface.
The projection display device described in Claim 8, which includes a luminance control module generating a dimming signal from current/dimming control signals and a dimming module that adjusts light source brightness accordingly, ALSO contains a microcontroller. This microcontroller receives setting commands from an input interface that dictate the current control signal and the dimming signal's behavior. This allows external control of the light source's brightness and dimming characteristics, possibly via a user interface or external device.
10. A projection display device, comprising: an image processing unit; a display unit electrically coupled to the image processing unit and configured for generating an image signal, the image signal comprising an image period and a black state period; a micro controller electrically coupled to the image processing unit; a light source driver electrically coupled to the micro controller and the display unit; and a projection light source electrically coupled to the light source driver and configured for projecting the image signal to a projection screen, wherein the projection light source is an ultra-high-performance (UHP) lamp, the light source driver is configured for generating a light driving signal to drive the projection light source, wherein the light driving signal comprises a first segment and a second segment in the black state period, and a signal average amplitude of the light driving signal in the second segment is lower than the signal average amplitude of the light driving signal in the image period, and the amplitude of the light driving signal is constant in the image period, wherein the average amplitude of the light driving signal in the first segment is larger than the average amplitude of the light driving signal in the second segment and the average amplitude of the light driving signal in the image period.
A projection display device includes an image processing unit, a display unit for generating an image signal with image and black state periods, and a microcontroller. A light source driver, connected to both the microcontroller and display unit, generates a driving signal for a UHP lamp. This light driving signal has a first and second segment during the black state period. The average amplitude in the second segment is lower than during the image period. During the image period the light driving signal amplitude is constant. The average amplitude of the driving signal in the first segment of the black state period is higher than both the second segment's amplitude AND the image period amplitude. Finally a projection light source projects the image signal onto a screen.
11. A driving method for driving a projection display device to display an image data, the driving method comprising: receiving and adjusting the image data to make the image data comprise an image period and a black state period; and adjusting a light driving signal of a projection light source of the projection display device to make the light driving signal comprise a first segment and a second segment in the black state period, and an average amplitude of the light driving signal in the second segment is lower than the average amplitude of the light driving signal in the image period, and the amplitude of the light driving signal is constant in the image period, wherein the projection light source is an ultra-high-performance (UHP) lamp, and the step of adjusting the light source driving signal of the projection light source further comprises: configuring the average amplitude of the light driving signal in the first segment to be larger than the average amplitude of the light driving signal in the second segment and the average amplitude of the light driving signal in the image period.
A method for driving a projection display device involves receiving and adjusting image data to create an image with image and black state periods. The method includes adjusting a light driving signal of a UHP lamp to have a first and second segment during the black state period. The average amplitude of the light driving signal in the second segment is lower than in the image period. The light driving signal amplitude is constant in the image period. The average amplitude of the light driving signal in the first segment is configured to be larger than the average amplitude of the light driving signal in the second segment and the average amplitude of the light driving signal in the image period.
12. The driving method of claim 11 , wherein a current level of the light driving signal in the first segment is configured to be higher than the current level of the light driving signal in the second segment during a positive half period of the light driving signal.
The driving method from Claim 11, where image data is adjusted to have image and black state periods, and the light driving signal is adjusted to have first and second segments in the black state period with the second segment's amplitude lower than the image period's and the first larger than both, configures the current level of the light driving signal in the first segment to be higher than the current level in the second segment, but ONLY during the positive half period of the light driving signal.
13. The driving method of claim 11 , wherein a current level of the light driving signal in the second segment is configured to be higher than the current level of the light driving signal in the first segment during the negative half period of the light driving signal.
The driving method from Claim 11, where image data is adjusted to have image and black state periods, and the light driving signal is adjusted to have first and second segments in the black state period with the second segment's amplitude lower than the image period's and the first larger than both, configures the current level of the light driving signal in the second segment to be higher than the current level in the first segment, during the negative half period of the light driving signal.
14. The driving method of claim 11 , wherein the average amplitude of the light driving signal in the second segment is configured to be equal to about 30% of the average amplitude of the light driving signal in the image period.
The driving method from Claim 11, where image data is adjusted to have image and black state periods, and the light driving signal is adjusted to have first and second segments in the black state period with the second segment's amplitude lower than the image period's and the first larger than both, configures the average amplitude of the light driving signal in the second segment of the black state period to be approximately 30% of the average amplitude of the light driving signal in the image period.
15. The driving method of claim 12 , wherein the average amplitude of the light driving signal in the second segment is configured to be equal to about 30% of the average amplitude of the light driving signal in the image period.
The driving method from Claim 12, where image data is adjusted to have image and black state periods, and the light driving signal is adjusted to have first and second segments in the black state period with the second segment's amplitude lower than the image period's and the first larger than both, and the first segment's current is higher than the second's during the positive half period, configures the average amplitude of the light driving signal in the second segment of the black state period to be approximately 30% of the average amplitude of the light driving signal in the image period.
16. The driving method of claim 13 , wherein the average amplitude of the light driving signal in the second segment is configured to be equal to about 30% of the average amplitude of the light driving signal in the image period.
The driving method from Claim 13, where image data is adjusted to have image and black state periods, and the light driving signal is adjusted to have first and second segments in the black state period with the second segment's amplitude lower than the image period's and the first larger than both, and the second segment's current is higher than the first's during the negative half period, configures the average amplitude of the light driving signal in the second segment of the black state period to be approximately 30% of the average amplitude of the light driving signal in the image period.
17. The driving method of claim 11 , wherein the step of adjusting the light source driving signal of the projection light source of the projection display device further includes: configuring the average amplitude of the light driving signal in the first segment and the second segment to zero.
The driving method from Claim 11, where image data is adjusted to have image and black state periods, and the light driving signal is adjusted to have first and second segments in the black state period with the second segment's amplitude lower than the image period's and the first larger than both, further configures the average amplitude of the light driving signal in both the first segment AND the second segment of the black state period to be set to zero.
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February 26, 2014
August 8, 2017
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